Abstract
The effects of inadequate shoulder contact and poor gas shielding were examined in friction stir welds of ATI 425 titanium. Welds with varying oxidation induced surface discolorations due to poor gas shielding and varying amounts of shoulder contact were studied to determine the effects of these parameters on the microstructure, microhardness, and three-point bend test properties of the welds. The effects of these parameters and their effects on the mechanical properties of the resultant weld are discussed.
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